Electrically-driven fan.



A. SCHAEFFER.

ELECTRICALLY DRIVEN FA'N.

APPLICATION FILED E8. 6. I9I2.

Patented Nov. 16, 1915.

' W17): an e:

Inventor.

STATES PATENT" OFFICE.

nuousrsonanrrnn, or rnANxFonr-oN-Tnn-MAIN, GERMANY.

To all whom it'may concern:

Be it known that I,.A cUs'r SCHAEFFER, a citizen of the German Empire, and residing at Moselstrasse 40, Frankfort-on-the Main, Germany, have invented anew and useful Improvement in and Connected with Electrically-Driven Fans, of which the following is a specification.

The invention relates to an electrically driven fan constructed as a hand apparatus such as are applied to warm and cold air douches. Hitherto in such devices it has been usual as for example in the parent application Serial No. 635421 to provide both the motor and blower with a special casing and these parts are inclosed in a common protecting casing which carries the air inlet and outlet as well as a handle and the electrical contacts, and the whole presents a neat external appearance. This manifold arrangement of casinghowever not only substantially increases the weight of the hand apparatus but also greatly increases its size. 'This is a considerable disadvantage especially in hand apparatus because in these the handle must be arranged on the common casing so as to get an" easy balance and the result of this is that owing to the masses lying away from the center of gravity when the apparatus isfput out-of balance, it 1s necessary to exert considerable force to hold it in that .position or to restoreit. On theother hand it is desirable in order to avoid trouble in the operation of such apparatus in which the between the common casing and the motor and blower as large as possible. Another greater disadvantage of this apparatus,

which in the same way arises from the multiplication of. the casings, is the difiiculty of accessibility of the parts Owing to the high speed and temperature the delicate parts require frequent repair orat any rate must be frequently inspected. Also owing to the high speed of the air and the great amount of air sucked through the apparatus, the

parts .become unavoidably worn and dirty so that it is advantageous if theapparatus can be blown out and cleaned in a simple manner. The hand apparatus hitherto on the market are owing tov their numerous covers quite inaccessible to the ordinary per- According" to the present invention, the

Specification of Letters Patent.

ELECTBICALLY-DBIVEN FAN.

Patented Nov. 16, 191-5.

Application-filed February 6, 1912. Serial No. 675,888.

lap one another and are mounted directly in a slngle casing preferably lens shaped which is provided with electrical connections, with inlet andoutlet and with a handle and is formed from two casing members joined together for example by engaging projections on the cover. All the bearings and supportstill more in those in which the motor gives out considerable heat, renders impossible undesirable or undue heating of the outer accessible parts especially the casing. This 1s because owing to the continuous change of air the heat is continually conducted to the outside at once. Thus. an efiect isobtainedwhich cannot be set up except by the provision of a verylarge operative space between the outside protecting casing and the inner parts. v

The invention will first 'be hereinafter more particularly described with reference to the accompanying drawings, which form apart of this specification, and then be polnted out in the claims at the end of the description.

In said drawings: Figure 1 is a vertical sectional elevation of an electrically driven fan embodying my invention; Fig. 2 is a side elevation of the same part1 in section but with the casing member on t e near side removed so as to show the fan and motor mounted within the casing, and Fig. 3 is a side elevation of the right hand casing member deta ched, looking at the inner sidethereof.-

In carryin out my present invention, I

0th the motor and fan, and which is composed of two parts or members 01 and 6, adapted to fit closely together by means of a .lip carried by one of said members which fits outside and overlaps the other member when the two members are brought together. Each of these casing members carries, or may have cast as an integral part thereof one-half of the outlet pipe or tube 70, and one-half of a threaded stud or nipple onto which the handle is screwed, so that when the two parts of the casing are closed, a ring 9 secured. around the outlet pipe, and

a nut or threaded washer f screwed onto said stud or nipple will hold said parts together.

The casing'member d has mounted thereon, inany suitable manner, as by a bridge Z bolted thereto, the stator a with its windings b, and the rotor'c, said stator and rotor constituting the electric motor and having suitable electric contacts carried by the casing member d, the other casing member'e being entirely free from any connection with the motor or any of its auxiliary parts. The fan blades k are secured directly upon the axle of the motor and immediately adjacent thereto, and consist of radial branches extending outwardly from the axle, and outer axial branches or extensions projecting from the ends of the radial branches, up and over the top of the motor, both branches of the fan blades following the contour of the casing and fitting as closely as possible to both the motor and the casing, without being-in actual contact therewith. Ithus provide a large air-propelling surface within a small space and also cause the air to play around the motor and prevent heating ofthe same. Apertures 2' are provided in the casing member 6 through which the air is drawn centrally into the casing while it is thrown out centrifugally through the outlet pipe or tube is.

It will thus be seen that in my present invention the various parts are brought close to the center of gravity,the rotor or armature of the motor being fitted closely to the shaft whereby the effect of vibration and gyroscopic motion is largely overcome, so

that, the arm is not quickly tired by an effort to balance the apparatus.

Having thus described my inventionwhat I claim as new and desire to secure by Let ters Patent of the United States is: w

1. In an air douche, the combination of a pair of pan-like sections joined at the edges of their open sides; said sections being provided with projecting delivery nipple members at one side, a ferrule sleeved upon said -delivery nipple members of said fan casing sections and a motor carried by-one of said sections.

2.v In an air douche, the combination'of a pair of pan-like sections joined at the edges of their open sides; said sections being provided with projecting deli-\ 'ery nipple members at one side, a ferrule sleeved upon said delivery nipple members ofsaid fan casing sections, a motor carried by one of said sections, and'a series of fan blades mounted on said motor.

3. In an air douche, the combination of-a ,pair of pan-like sections joined at the edges of their open sides, and a motor carried by one of said sections, and the other of said sections being provided with inlet openings disposed around the shaft of said motor;

* said sections being provided with projecting AUGUST SCHAEFFER.

Witnesses FRIEDRICH CARL WENTZEL, MAX HERMANN HGPPNER. 

